// Fig. 10.26: CompensationModel.h
// CompensationModel "interface" is a pure abstract base class.
#pragma once // prevent multiple inclusions of header
#include <string> 

class CompensationModel {
public:
   virtual ~CompensationModel() = default; // generated destructor 
   virtual double earnings() const = 0; // pure virtual
   virtual std::string toString() const = 0; // pure virtual              
};



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